If you don't realize that scores may be affected by random error, you may fail to detect ____ effects.
A) instrumentation
B) selection by maturation
C) selection
D) regression

Question

Quizplus · Accepted Answer

Regression effects refer to the statistical phenomenon where extreme scores tend to move towards the mean on subsequent testing, which can be mistaken for a real change if random error is not considered.

If You Don't Realize That Scores May Be Affected by Random